Friction measurement methods and the correlation between road - VTI

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is a large scatter in the percentage of wet-road accidents for each friction level, thegeneral trend of the increasing percentage of wet-road accidents with thedecreasing friction level is unmistakable, (Figure 4.6).Figure 4.6 Percentage of wet-road accidents against friction number.In France [49], skid-prone sites were compared with a random sample of sites,Figure 4.7. When the friction coefficient decreases, the relative proportion ofaccidents at skid-prone sites increases sharply. The braking force was measuredwith locked wheel.32 VTI meddelande 911A
Figure 4.7 Histograms of locked wheel braking force coefficients on accidentsites and on randomly selected sites.Griffin [18] accounts for a study of wet weather accidents. Several variableswere used as surrogates for vehicle demand for friction in a multiple linearregressionmodel:ADT: average daily trafficACC: access (a standardised subjective scale of roadway congestion)SN: skid number at 40 mphTW: proportion of time wetVM: mean traffic speedV: standard deviation of the speed distributionLN: lanes of traffic.VTI meddelande 911A 33
Page 1 and 2: VTI meddelande 911A • 2001Frictio
Page 3 and 4: Publisher:Publication:VTI meddeland
Page 5 and 6: ContentsAcknowledgementsSummary 51
Page 7 and 8: 1 IntroductionRoad friction, its me
Page 9 and 10: 3 Road friction measurementFriction
Page 11 and 12: 0,70,60,50,40,30,20,10Dense asphalt
Page 13 and 14: 3.1.1 Friction measurement devicesW
Page 15 and 16: BV11 is a trailer with the water ta
Page 17 and 18: Figure 3.7 The VTI Saab Friction Te
Page 19 and 20: Some devices use a fixed slip, like
Page 21 and 22: In Sweden mainly three friction mea
Page 23 and 24: 10 cmFigure 3.12VTI Portable Fricti
Page 25 and 26: The concept of international fricti
Page 27 and 28: Öberg [60] has compiled measuremen
Page 29 and 30: homogeneity of the surface conditio
Page 31: Figure 4.5 Accident rate (mean and
Page 35 and 36: RoadwayappearanceDriverbehaviourAcc
Page 37 and 38: A number of surveys of friction num
Page 39 and 40: Figure 4.14 Multiplier for locked-w
Page 41 and 42: Table 4.2 Accident rates at differe
Page 43 and 44: 5 References1. Instructions for usi
Page 45 and 46: slitlagerbeläggning - inverkan på
Page 47: 50. Sävenhed H: Relation Between W

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